StretchDIBits能正常显示图片,保存为BMP图片花屏.

[swdraven2013]

#define PIXEL_NUM		24
#define PIXEL_COUNT		8
保存BMP代码:
void SaveImage(BYTE *buff, int tWidth, int tHeight, CString OutPath)
{	
	FILE *fp;
	fp = fopen(OutPath, "w");
	if( !fp )
	{
		return;
	}
	else
	{
		int iBMPBytes = tWidth * tHeight * PIXEL_NUM / PIXEL_COUNT;

		BITMAPINFO lpbmih;
		lpbmih.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
		lpbmih.bmiHeader.biWidth = tWidth;
		lpbmih.bmiHeader.biHeight = tHeight;
		lpbmih.bmiHeader.biPlanes = 1;
		lpbmih.bmiHeader.biBitCount = PIXEL_NUM;
		lpbmih.bmiHeader.biCompression = BI_RGB;
		lpbmih.bmiHeader.biSizeImage = iBMPBytes;
		lpbmih.bmiHeader.biXPelsPerMeter = 0;
		lpbmih.bmiHeader.biYPelsPerMeter = 0;
		lpbmih.bmiHeader.biClrUsed = 0;
		lpbmih.bmiHeader.biClrImportant = 0;
		
		BITMAPFILEHEADER bmfh;		
		ZeroMemory(&bmfh,sizeof(BITMAPFILEHEADER));
		bmfh.bfType = 0x4d42;
		bmfh.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);
		bmfh.bfSize = bmfh.bfOffBits + (tWidth * tHeight) * PIXEL_NUM / PIXEL_COUNT;
		
		fwrite(&bmfh, 1, sizeof(BITMAPFILEHEADER), fp);
		fwrite(&(lpbmih.bmiHeader),1, sizeof(BITMAPINFOHEADER), fp);
		fwrite(buff, 1, iBMPBytes, fp);
		fclose(fp);
	}
}



显示代码:
void Capture(BYTE *buff, int tWidth, int tHeight)
{ 	
	BITMAPINFO lpbmih;
	lpbmih.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
	lpbmih.bmiHeader.biWidth = tWidth;
	lpbmih.bmiHeader.biHeight = tHeight;
	lpbmih.bmiHeader.biPlanes = 1;
	lpbmih.bmiHeader.biBitCount = PIXEL_NUM;
	lpbmih.bmiHeader.biCompression = BI_RGB;
	lpbmih.bmiHeader.biSizeImage = 0;
	lpbmih.bmiHeader.biXPelsPerMeter = 0;
	lpbmih.bmiHeader.biYPelsPerMeter = 0;
	lpbmih.bmiHeader.biClrUsed = 0;
	lpbmih.bmiHeader.biClrImportant = 0;
	
	RECT	rc;
	m_StaticDisplay.GetClientRect(&rc);
	CDC*	srcDc = m_StaticDisplay.GetDC();
	SetStretchBltMode(srcDc->m_hDC,COLORONCOLOR);
	StretchDIBits(
srcDc->m_hDC,rc.left,rc.top,rc.right,rc.bottom,0,0,tWidth,tHeight,buff,&lpbmih,DIB_RGB_COLORS,SRCCOPY);
	ReleaseDC(srcDc);
}

两段BUFFER是一模一样的.

[schlafenhamster]

处理调色板？
参考：
///////
BOOL SaveBitmapToFile(HBITMAP hBitmap, LPCSTR lpszFileName)
{
HDC hDC; //设备描述表
int iBits; //当前显示分辨率下每个像素所占字节数
WORD wBitCount; //位图中每个像素所占字节数
//定义调色板大小， 位图中像素字节大小 ， 位图文件大小 ， 写入文件字节数
DWORD dwPaletteSize=0,dwBmBitsSize,dwDIBSize, dwWritten;
BITMAP Bitmap; //位图属性结构
BITMAPFILEHEADER bmfHdr; //位图文件头结构
BITMAPINFOHEADER bi;//位图信息头结构
LPBITMAPINFOHEADER lpbi; //指向位图信息头结构
HANDLE fh, hDib, hPal;
HPALETTE hOldPal=NULL;//定义文件，分配内存句柄，调色板句柄

//计算位图文件每个像素所占字节数
hDC = CreateDC("DISPLAY",NULL,NULL,NULL);
iBits = GetDeviceCaps(hDC, BITSPIXEL) *
GetDeviceCaps(hDC, PLANES); //?
DeleteDC(hDC);
if (iBits <= 1) wBitCount = 1;
else if (iBits <= 4) wBitCount = 4;
else if (iBits <= 8) wBitCount = 8;
else if (iBits <= 24) wBitCount = 24;
else wBitCount = 32;
//计算调色板大小
if (wBitCount <= 8) dwPaletteSize=(1 << wBitCount)*sizeof(RGBQUAD);

//设置位图信息头结构
GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&Bitmap);
bi.biSize = sizeof(BITMAPINFOHEADER);
bi.biWidth = Bitmap.bmWidth;
bi.biHeight = Bitmap.bmHeight;
bi.biPlanes = 1;
bi.biBitCount = wBitCount;
bi.biCompression = BI_RGB;
bi.biSizeImage = 0;
bi.biXPelsPerMeter = 0;
bi.biYPelsPerMeter = 0;
bi.biClrUsed = 0;
bi.biClrImportant = 0;

dwBmBitsSize = ((Bitmap.bmWidth*wBitCount+31)/32)*4*Bitmap.bmHeight;
//为位图内容分配内存
hDib = GlobalAlloc(GHND,dwBmBitsSize+dwPaletteSize+sizeof(BITMAPINFOHEADER));
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib);
*lpbi = bi;
// 处理调色板
hPal = GetStockObject(DEFAULT_PALETTE);
if (hPal)
{
hDC = ::GetDC(NULL);
hOldPal=SelectPalette(hDC,(HPALETTE)hPal,FALSE);
RealizePalette(hDC);
}
// 获取该调色板下新的像素值
GetDIBits(hDC,hBitmap,0,(UINT)Bitmap.bmHeight,(LPSTR)lpbi+sizeof(BITMAPINFOHEADER)+dwPaletteSize, (BITMAPINFO *)lpbi,DIB_RGB_COLORS);
//恢复调色板
if (hOldPal)
{
SelectPalette(hDC, hOldPal, TRUE);
RealizePalette(hDC);
::ReleaseDC(NULL, hDC);
}
//创建位图文件
fh=CreateFile(lpszFileName, GENERIC_WRITE,0, NULL, CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);
if (fh==INVALID_HANDLE_VALUE) return FALSE;
// 设置位图文件头
bmfHdr.bfType = 0x4D42; // "BM"
dwDIBSize=sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+dwPaletteSize+dwBmBitsSize;
bmfHdr.bfSize = dwDIBSize;
bmfHdr.bfReserved1 = 0;
bmfHdr.bfReserved2 = 0;
bmfHdr.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER)+(DWORD)sizeof(BITMAPINFOHEADER)+dwPaletteSize;
// 写入位图文件头
WriteFile(fh, (LPSTR)&bmfHdr, sizeof(BITMAPFILEHEADER), &dwWritten, NULL);
// 写入位图文件其余内容
WriteFile(fh, (LPSTR)lpbi, sizeof(BITMAPINFOHEADER)+dwPaletteSize+dwBmBitsSize , &dwWritten, NULL);
//清除
GlobalUnlock(hDib);
GlobalFree(hDib);
CloseHandle(fh);
return TRUE;
}

[swdraven2013]

[Quote=引用 3 楼 的回复:]
处理调色板？
参考：
///////
BOOL SaveBitmapToFile(HBITMAP hBitmap, LPCSTR lpszFileName)
{
HDC hDC; //设备描述表
int iBits; //当前显示分辨率下每个像素所占字节数
WORD wBitCount; //位图中每个像素所占字节数
//定义调色板大小， 位图中像素字节大小 ， 位图文……
[/Quote]

我的那段buffer是从摄像头传过来的,应该已经包括了调色板的内容了.

[dog357]

用CImage类保存方便

[swdraven2013]

结了。果然是调色板那的问题，不过还是没有自己改，用了DIBAPI这个库。

[swdraven2013]

居然没人回??100分啊,快来人拿走啊.

[笨笨兔兔兔兔兔]

http://blog.csdn.net/strikebone/article/details/1750331

跟这篇文章逐步对照,感觉你写的文件头的size算得不太对